Improvement in steam-cocks



UITED STATES PATENT OEEICE.

ALBERT TYLER AND GEORGE F. KENDALL, OF FITGHBURG, MASS.

IMPROVEMENT IN STEAM-COCKS.

Specification forming part of Letters Patent No. 49,666, dated August 29, 1865.

To all whom lt may concern: percha annulus r to aid in making a tight joint Be it known that we, ALBERT TYLER and between the footof the key and the top of the GEORGE F. KENDALL, of Fitchburg, in the cap B, because it is far preferable to either county of Worcester and State of Massachumetal, leather, or wood, on account of the pesetts,have invented anlmproved Steam-Cock, culiar action of the steam upon it. Although and we do hereby declare the same to be fully when cool, or at ordinary atmospheric tempera described in the f'ollowing speciiication and ture,theannnlusishard,yet whenitis subjected represented in the accompanying drawings, of to the action of hot steam it softens and swells, which-- and thus operates to tighten the joint; and it Figure l is an elevation, and Fig. 2 a vertiwill always retain its normal condition in other cal and longitudinal section, of it. respectsthat is, it will not be :rotted or in- Much difficulty has been experienced in prejured by the steam, as is the case with wood venting the leakage around the valvestem of or leather nor is it, like metal, liable to be afa common steam-cock, especially when the fectedby oxidizing agents usuallyin the steam. stem, in order to move the valve, has a longi- Thus by the use of the vulcanized material a tudinal as well asarot-arymotionimparted to it. mechanical action takes place when it be- In theconstruction of our steam-cock we emoomes heated by the steam, such mechanical ploy, to revolve the valve-stem l thereof, a key, action operating to increase or insure the ti ght G, which is provided with a hand-wheel, D, ness of the joint. and when in action has a rotary motion only. By means of the passage c, leading out of In this key we form aprismatic chamber, k, to the chamber n and into the valve-chamber, we tit transversely to the prismatie head l of the are enabled to readily discharge from the said stem. Within the screw-cap B of the chamber n any air or water \vhich,by accumuvalve-caseA we make a chamber, n, which surlating in the chamber and also in the space 7l', rounds the head land the stem l, and is situated would tend to impede the proper operation ot' above the female screw m, which receives the the valve and its key. male screw u, formed on the stem l. The Itis well known that after thevalvehas been chamber n we open into the valve-case above closed the steam is apt to condense in the upthe valve-seat @by means of a passage,o,bored per part of the valve-chamber and in the conupward in the cap B, and arranged therein in duit leading thereto, and frequently to such manner as shown in Fig. a. The chamber a extent as to pass between the screws of the also has free steam-connection with the chamstem and enter and fill the chambers n and 7c. ber 7c within the key, the same being in conse- Under these circumstances it will be seen that quence of the head l of the valve-stem being were it not for the expulsion-passage c the key loosely fitted in the chamber 7c. A nut, E, is would be turned at first with considerable dit'- screwed on the screw 1J of the cap B, and flculty in an attempt to open or raise the valve, against a softmetal annulus or washer, s, as the accumulated water acts as an impediplaced on the top of a projection, q q, extendment to the rotation of the key and the lifting ing from and aroundthe lowerpart ofthe key C. of the valve, and were it not for the passage o The lower end of the key G rests on an annular the water accumulated in the chambers ls and gasket or collar r of vulcanized indiarubber a would have to be expelled through the naror gutta-percha, such collar or annulus r being row space between the male screw of the valveplaced on the upper part of the case-cap B, and stem and the female screw of the cap B. being encompassed by the auxiliary screw-cap The checknut F is not only for the purpose E. A check-nut, F, is also screwed on the of preventing the auxiliary cap E from being male screw p and up against the cap E. revolved by the key, but is to aid in effecting The caseA,like that of various other steama tight joint or preventing the escape of steam cocks, is furnished with a valve-seat partition, from between the screws of the said auxiliary c, extending across it in manner as shown in cap E and the main cap B. Fig. 2. This partition has apeculiar passage, Ve are aware that it is not new in faucets to c, made through it, andhaving a conical valve have the valve move vertically without any ro* seat, e, to receive the valve f. tary motion, and to be lifted by a screw having We employ the vulcanized-rubber or gutta a rotary but no longitudinal motion. There fore We do not claim such; nor do We claim a substantially upon the principle and in the steam-oook made not only with lifting-screws manner hereinbefore set forth.

arranged with or applied to the stem of the 2. The combination of the passage v with valve and the cap of' the valveoase, but with the chamber n and the chamber k, arranged as the valve-stem provided with a key-socket to described.

receive the key-head.

What we claim as new, and desire to secure ALL by Letters Patent, is- I l. The arrangement of the prismatie eham- Witnesses: ber k Within the key C, above the chamber u, R. H. EDDY,

with the head t projeetingfrom the valve-stem, F. P. HALE, J r. 

